Improvement in metallic grinding-rings for mills



lMmn' Grinding Rings for. Mms.

iPat-ented Nov. 26, 1872.`

UNITED STATES PATENT OFFICE.

GEORGE OCONNOR AND HAINES OCQNNOR, OF MISHAWAKA, INDIANA.

IMFROVEMENT IN METALLIC GRINDING-RINGS FOR MILLS.

Specification forming part of Letters Patent No. 133,333, dated November2d, 1872.

To all whom it may concern:

Be it known that we, GEORGE OGONNOR and HAINES OGONNOR, of Mishawaka, inthe county of St. Joseph and State of Indiana, have invented certainImprovements in Grinding-Mills, of which the following is aspecification':

The nature of our invention consists in the construction, arrangement,and operation of two similar grindingplates, one stationary and theother revolving upon it.

Figure 1 represents a section of the face of the grindin g-plates. Fig.2 represents the line of action of the ridges and grooves when inoperation. Fig. 3 represents a sectional view of the two plates, whenplaced together for work, cut through the receivers.

The plates are constructed with ridges a. a, receivers b b, and illegrooves cut from the periphery down the slant of the receivers, formingthe ridges o c. The ridges a a stand at a suicient angle to the innercircumference of the plates to take in and throw otf the grain and mealby acting across each other, as at f f, Fig. 2. The ne grooves c c startat the periphery and run down the slanting face ofthe receivers, so thata sectional view obtained by cutting through the receivers when theplates are placed together presents a wedge-shaped opening, as seen ate, Fig. 3. The grain is forced outward in the receivers by the action ofthe ridges a a into the wedge-shaped opening c, when it soonV arrives ata point Where it begins to be crushedby the action of the ridges o c.The nishingup or fine grinding is all done at the point the plates.

This ne grinding all being done at the eX- treme outer edge oftheplates, instead of being distributed over a considerable portion of thesurface of the plates, we find, by experi! ence, enables ns to grindwith far less consumption of power than has ever been accomplishedheretofore.

When the grindingsurface becomes worn smooth it will be only necessaryto grind or out down the stationary ring by grinding ott' the outside ofthe ring at an angle until the portion so ground or cut away shall meetthat part of the fine dress c o not worn, .and by grinding down theridges a. a to correspond, when the ring will present a grindingsurfaceas good as new, which process may be renewed until the ring is worn out.

We do not broadly claim in this application a line dress extending ashort distance from the periphery of the plate; but,

Having thus fully described our invention,

g, Fig. 3-the periphery of what we claim, and desire to secure byLetters Patent, is-

A detachable grindingring, when provided with the receivers and linedrifts on the incline and the point of surface, all constructed andarranged substantially as and for the purpose herein specified.V

\ GEORGE OCONNOR.

Witnesses:

A. I. PETTIT, J. H. WHITsoN.

HAINES OCONNOR.

